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Update renameKeys.md

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Angelos Chalaris
2018-04-10 23:03:42 +03:00
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commit d40f859288
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snippets/renameKeys.md
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### renameKeys
Renames multiple object keys
Replaces the names of multiple object keys with the values provided.
Get the object's keys with `Object.keys()` and return an object with the new keys, according to the `keysMap`, using `Array.reduce()`.
The initial value is an empty object which is used as the accumulator, `acc`, in the callback function. Using the spread operator `(...)`, `acc` is continuously merged with a new object containing the new key and original object's value. If a new key doesn't exist, fallback to original object's key.
Use `Object.keys()` in combination with `Array.reduce()` and the spread operator (`...`) to get the object's keys and rename them according to `keysMap`.
```js
const renameKeys = (keysMap, obj) =>
Object.keys(obj).reduce(
(acc, key) => ({
...acc,
...{ [keysMap[key] || key]: obj[key] }
}),
{}
);
const renameKeys = (keysMap, obj) => Object
.keys(obj)
.reduce((acc, key) => ({
...acc,
...{ [keysMap[key] || key]: obj[key] }
}), {});
```
```js
const obj = { name: 'Bobo', job: 'Front-End Master', shoeSize: 100 };
renameKeys({ name: 'firstName', job: 'passion' }, obj);
// { firstName: 'Bobo', passion: 'Front-End Master', shoeSize: 100 }
renameKeys({ name: 'firstName', job: 'passion' }, obj); // { firstName: 'Bobo', passion: 'Front-End Master', shoeSize: 100 }
```